Keeping the lights on for consumers during network disturbances is a major challenge for power engineers. Distributed generation can supply power close to the point of use and, although not current UK practice, many can operate in isolation of the grid supply. To achieve this, their control scheme needs to be modified for islanded operation and other system considerations need attention. Arguably the greatest challenge is reconnecting the power island to the grid supply. For this a specialist controller is presented which controls the point of reclosure of the breaker used to reconnect the two networks.
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